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slides/summer_institute/04_python_progamming.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "04e5766e-1b6f-45b8-98a4-ff15044c3120",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    },
+    "tags": []
+   },
+   "source": [
+    "# Python programming 1"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "5cde6156-39c3-4898-b016-6ce89ab8cb5c",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    },
+    "tags": []
+   },
+   "source": [
+    "## Control flow"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "ebbd20d1-9176-4d2b-9873-ce6cf51131f9",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    },
+    "tags": []
+   },
+   "source": [
+    "###  If statements\n",
+    "\n",
+    "+ Python has if statements like most programming languages\n",
+    "+ Notice the indentation and the `:`"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "f33a408a-84cd-4b5a-8511-0cfea531383a",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Gryffindor\n"
+     ]
+    }
+   ],
+   "source": [
+    "# do this if you'd like to prompt for an input\n",
+    "# x = input(\"are you mean (y/n)? > \")\n",
+    "# Let's just assume the user input 'n' and just assign x='n'\n",
+    "x = 'n'\n",
+    "if x == 'y': \n",
+    " print(\"Slytherine!\")\n",
+    "else:\n",
+    " print(\"Gryffindor\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "c6e719b7-882c-4441-86fa-42d3e2418dcc",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    },
+    "tags": []
+   },
+   "source": [
+    "### White space\n",
+    "\n",
+    "+ White space is more meaningful in python than other languages\n",
+    "+ This is actually useful, as it forces good indentation practices\n",
+    "\n",
+    "```\n",
+    "## Some more about white space\n",
+    "if statementA:\n",
+    "  statementB   # Executed if statementA is True\n",
+    "statementC     # Executed regardless since it's not indented\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "19bd82bb-bc6f-4b5a-8436-a6077302b547",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    },
+    "tags": []
+   },
+   "source": [
+    "### General if statment structure\n",
+    "\n",
+    "\n",
+    "```\n",
+    "if statement1 :\n",
+    " ...\n",
+    "elif statement2 :\n",
+    " ...\n",
+    "else \n",
+    " ...\n",
+    "```\n",
+    "Here's an example (note this is just equal to the statement `(a < 0) - (a > 0)`"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "4afd61f3-3fb6-471a-b14a-c188a7de854c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "a = 5\n",
+    "\n",
+    "if a < 0 :\n",
+    "  a = -1\n",
+    "elif a > 0 :\n",
+    "  a = 1\n",
+    "else :\n",
+    "  a = 0\n",
+    "\n",
+    "print(a)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "bd30d824-8081-4369-be21-b2b12d16f126",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    },
+    "tags": []
+   },
+   "source": [
+    "## for and while loops"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "cacc1a7f-1ee0-4aed-a49f-5f93069c1b09",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    },
+    "tags": []
+   },
+   "source": [
+    "### looping in python\n",
+    "\n",
+    "+ Python has for and while loops \n",
+    "+ for loops will iterate over most objects for which it makes sense\n",
+    "+ Don't forget the indentation or the `:`\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "fa4cbf09-07ff-469e-82ee-48ad2b4c2c64",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "t\n",
+      "e\n",
+      "s\n",
+      "t\n"
+     ]
+    }
+   ],
+   "source": [
+    "for i in \"test\":\n",
+    "    print(i)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "e28a1bb2-141d-4944-aebe-d521e4c165a3",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 2]\n",
+      "[3, 4]\n"
+     ]
+    }
+   ],
+   "source": [
+    "for i in [[1, 2], [3, 4]]:\n",
+    "    print(i)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "a0fec0d4-a6dd-4bca-b059-2ee2eee329aa",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    },
+    "tags": []
+   },
+   "source": [
+    "### range\n",
+    "+ range is a function that creates an iterable list of integers\n",
+    "+ `range(4)` is not itself a list, but `list(range(4))` is"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "id": "aa749189-53a3-4698-9d3a-0cb0d2c2a8f4",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "<class 'range'>\n",
+      "<class 'list'>\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(type(range(4)))\n",
+    "print(type(list(range(4))))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "0f3c2311-672b-4728-89c3-8ac96ebb72d7",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "for i in range(4) :\n",
+    " print(i)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "315beabe-a999-4b5d-84ea-9f7259f7d7b8",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    },
+    "tags": []
+   },
+   "source": [
+    "### While loop example"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "id": "1d14a8bf-42dd-4018-bdf1-239262248ed2",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "3\n",
+      "2\n",
+      "1\n",
+      "0\n"
+     ]
+    }
+   ],
+   "source": [
+    "x = 4\n",
+    "while x > 0 :\n",
+    " x = x - 1\n",
+    " print(x)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.7"
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+ },
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+}